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Sensor with electromagnetically coupled hermetic pressure reference

a technology of electromagnetic coupling and pressure reference, applied in the field of sensors, can solve the problems of reducing the reliability of feedthrough, further exacerbated, and the volume change of the pressure reference does not substantially offset the pressure in the pressure reference, so as to reduce the sensitivity to external electromagnetic effects

Inactive Publication Date: 2011-09-27
ST JUDE MEDICAL LUXEMBOURG HLDG II S A R L SJM LUX II
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This solution enhances the reliability and durability of sensors by eliminating a common failure point, allowing them to maintain electrical communication with the environment while maintaining hermeticity, suitable for harsh and biological environments, such as medical implants, without compromising sensitivity to pressure changes.

Problems solved by technology

If the deflection of the diaphragm or plate is sufficiently small, the volume change of the pressure reference does not substantially offset the pressure in the pressure reference.
As is known in the art, such feedthrough locations are typically sites for failure of hermeticity.
This problem is further exacerbated when miniaturizing the sensor, since the total volume of material available for hermetic sealing shrinks proportionally and the reliability of the feedthrough is also greatly reduced.

Method used

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  • Sensor with electromagnetically coupled hermetic pressure reference
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Examples

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Embodiment Construction

[0028]Referring now to the drawings, in which like numerals indicate like elements throughout the several views, FIGS. 1 and 2 illustrate a sensor 2 comprising a sensor body 4. The sensor body 4 is formed from electrically insulating materials, particularly biocompatible ceramics and polymers. Suitable ceramic materials include glass, fused silica, sapphire, quartz, or silicon. Suitable polymeric materials include polyimide, liquid crystal polymer (LCP), urethane, polyester, Teflon, FEP, PTFE, polyamide and silicone rubber, treated or configured such that the permeation of these materials is reduced to a level such that leakage rates are commensurate with the definition of hermeticity provided herein. Additionally, the sensor 2 can incorporate radiopaque features to enable fluoroscopic visualization during placement within. the body.

[0029]The sensor body 4 defines a hermetic chamber 6. One of the walls 7 defining the hermetic chamber 6 comprises a deflectable region 8 configured to ...

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PUM

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Abstract

An electromagnetically coupled hermetic chamber includes a body defining a hermetic chamber. A first conductive structure is disposed within the hermetic chamber, and a second conductive structure is attached to the body outside of the hermetic chamber. The first conductive structure is electromagnetically coupled to the second conductive structure without direct electrical paths connecting the first and second conductive structures. Thus the first conductive structure can be coupled to external electronics without the need for electrical feedthroughs or vias that could compromise the integrity of the hermetic chamber.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is entitled to the filing date of provisional U.S. patent application Ser. No. 60 / 670,549, filed Apr. 12, 2005.FIELD OF THE INVENTION[0002]The present invention relates to sensors comprising hermetic packaging that eliminates the need for electrical feedthroughs, and sensors configured utilizing the same, all of which are intended to perform reliably in harsh and biological environments.BACKGROUND OF THE INVENTION[0003]Over the past 20 years, advances in the field of microelectronics have enabled the realization of microelectromechanical systems (MEMS) and corresponding batch fabrication techniques. These developments have allowed the creation of sensors and actuators with micrometer-scale features. With the advent of the above-described capability, heretofore implausible applications for sensors and actuators are now significantly closer to commercial realization.[0004]In parallel, much work has been done in the developm...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): A61B5/00
CPCA61B5/021A61B5/03
Inventor ALLEN, MARK G.
Owner ST JUDE MEDICAL LUXEMBOURG HLDG II S A R L SJM LUX II